CVE-2026-99286

In the Linux kernel, the following vulnerability has been resolved:

xen-netback: Fix XenBus connection failure cleanup

xenvif get stats and xenvif get ethtool stats capture vif->num queues under rcu read lock. We need to unpublish vif->num queues before synchronize net to ensure that readers that come afterwards will not read a non-zero vif->num queues and attempt to access invalid queues.

This is the same cleanup algorithm as used in backend disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect").

This is XSA-531